function Person() {
    this.name = "Coder"
};

Person.prototype = {
    constructor: Person,
    job: "MN"
}

var wht = new Person();

Object.defineProperty(wht, "sex", {
    value: "female",
    enumerable: false
})
for (var pro in wht) {
    console.log("wht." + pro + "=" + wht[pro]);
}
console.log("-------------");
console.log(Object.keys(wht));
console.log("-------------");
console.log(Reflect.ownKeys(wht));